Typewriting machine



Dec. 18, 1945. F. P. KUHL Y TYPEWRITING MACHINE Filed'June 14', 1945 3 Sheets-Sheet l V ATTORNEYI- Dec. 18, 1945. F. P. KUHL TYPEWRITING MACHINE 3 Sheets-Sheet 2 Filed June 14, 1943 INVENTOR unk 22 mm ATTO RNEY Dec. 18, 1945. F. P. KUHL TYPEWRITING MACHINE 5 Sheets-Sheet 3 BY 7 mm? I? Ku/zl (If; ATTORNEY Filed June 14, 1943 Patented Dec. 18, 1945 Frank P. Kuhl, New York, N. Y., assignor to Underwood Corporation, a corporationv of Dela- .ware

Application June Li, 1943, SeriaLNo. 490,945

13 Claims. (01; 1973) This invention relates to typewriting machines and more particularly to machines of the so-called Elliott Fisher type provided with a substantially flat platenJg The machine embodying the invention is particularly designed for typing on large engineering drawings on tracin cloth oron other large sheets.

l The making of 'neat accurate lettering of ata'typewriting machine upon which large englf neerin drawings may be quickly and easily placed on a platen'in position for typing on any desired portion of the drawing and the required lettering applied thereto in an efficient manner withthe saving of considerable time and expense as com paredjwith hand executed lettering. I

j Another object of the invention is to provide a typewriting' machine for-typingon large engineering drawings in which the platen and type 'mech anisni are relatively'positioned I and .rigidly held during each typin operation so as to produce a type impression'of substantially uniform opacity.

' With the abo ve and other objects in view,the'

invention" consists in a machine embodying the novel and improved features, constructions; and combinations of parts hereinafter described, and particularly pointed outin the claims, the advan-I tagesofjwhicn will be readily understood and ai breciated' by those skilled in the art.

The invention will befclearly' understood from the accompanying drawings illustrating the invention in its, preferred form' and the following detailed description of "the constructions therein shown; 'i

In the drawings, H '1 isfl 'l, perspective view. illustrating a machine'einbodying theinvention, Fig. 2 isa view in side elevation of the machine,

illustrating the type'head,line .space frame and;

workclamping frame tilted back away fromfthe platen to enable a work sheet to be appliedfto or removedfrom the platen, the line space frame and the type head .being'shown in dot and dash lines,

1am and certain associated parts, partly broken @W V 5. d ta w. 've fwa r iqn t n through the rear portion of the platen and the I parts to the rear of the platen,

Fig. 5 is a view'in vertical section illustrating the forward portion of the platen and the parts ahead of the platen taken substantially on the line 5 5 of 'Fig. 3, I

"Figj'fi isadetail view in vertical section taken through a side marginal portion of the platen and certain associated parts,

Fig. '7 is a' detail exploded view illustrating the mechanism'for stopping the tilting movement in an upward' directionof the type head, the line space frameor carriage and the supporting frame for the line spacecarriage, and I ""Fig. Sis a detail view in front elevation with parts'in section illustrating the construction for supporting a bar adjacent the forward edge of the platen.

The typewriting machine in which the invention has been embodied, as illustrated in the drawings-of this application, is a machine of the so called Elliott Fisher or flat platen type having f Fig. 1819.1; underside plan view illustrating the r theisame general construction except as to the platen, the mounting means for the platen and the supporting frame for supporting the line space frame and for holding the work sheets on the platen, as themachine illustrated and described in the patent to 'Foothorap, No. 1,904,127, dated April 18, 1933. The machine comprises a substantially fiat platen, a line space frame or carriage movable forwardly and rearwardly over the platen to line space'the type mechanism with relation to'the platen, and atype head or type carriage mounted for letter spacing and return movement on the line'space frame. The line space frame, the mechanism for actuating and controlling said frame-t0 line space the type mechanism, the'type carriage, the type mechanism, and theescapement mechanism all preferably have substantially the same construction, arrangement and mode of operation as the corresponding mechanisms illustrated and described in said;Foothorap Patent No. 1,904,127.

The platen of the machine, indicated at 2 consists of the usual'flat plate fixedly supported in a substantially horizontal position upon a supporting plate 4 in spaced relation to the latter plate by means of u-shaped brackets 6 bolted respectively to the platen and to said supporting plate 4. These brackets furnish sturdy rigid supports for the platento hold the same firmly against the blowsofthe type as is required to givesharp clear-cut type impressions. The plate 4 maybe attached to any suitable rigid supporting device such as a table or desk 8 upon which the-typing operation is to be performed.

r The supporting frame for supporting the line space frame or carriage and for clamping a work sheetuponthe upper surface of the platen is indicated as a whole at I 0. This frame comprises side bars [2 arranged to extend, over the side margins of the platen 2 which normally supports said frame. front and rearcross bars l4 and i6 connecting the opposite ends" of the side bars and an intermediate cross bar l8 also connecting said side bars. a short distance beyond the platen at the front end of the platen and the cross bar this located forwardly of the platen and; in spaced relation thereto. The frame l extends-l some: distance beyond the platen at the rear and the intermediate cross bar [8 is locatedto the rear of the platen in spaced relation thereto as shown in, Fig. i, to form a slot l9 between the rearend oil.

the platen and said bar.

The side bars l2 of the supporting andwork holding frame Ill form tracks upon which is mounted for forward and rearward movement the line space frame indicated as" a whole atZll. The line space frame comprises front and. rear rails 22 and 24 rigidly connected'by'sidebarsifi and is provided with wheels or'rollers such as indicated at 28 and 29 engaging the track pfortions 30 of the side bars i2. The line space'frame carries gears 32' fixed to a horizontal" shaft 33 and engaging racks 3T respei'itivelyv attached to the. sidev bars l2 of the worli clamping frame. This shaft is rotated'to impart line'spaciiig. movements to the line space frame. Such movements may be impartedmanually to the line. space frame by means. ofa forwardly and rearwardly extend? ing rock shaft 36" mounted in bearings in said frame and operatively connected at its. rear end with mechanism for rotating the shaft 33 which may have substantially the construction shown and described in the patent to Foothorap, No. 1,275,413, dated August 13,. 1918; To the forward end of the rock shaft is fixed an anm by which the shaft may be rocked manuallyto actuate the line space frame.

Upon the line space. frameis. mounted. the. type carriage indicated asa whole at. As stated above, this carriage issupported for letter spacing. and return movements on-the front and rear rails 22-. and 24 of. the line space frame andis provided with wheels or rollers.- for engaging said rails. The type carriage;isractediupenibya metallic band 44 connected-- at one: end: with the type carriage and wound aboutaspring drum- 46;

In order. toenable the: line space carriage supe porting the work clamping. frame:-v "1-,. the: line space frame, and the type carriage to be: swung upwardly away from the platenisd that; a work sheet may be applied toorremoved from the platen, th supporting framei "L is. pivoted upon a horizontal axis locatedtothe rear of:- the: platen in spaced relation thereto and lyingin' a plane below the plane of the platen. In: the construction shown, a horizontalshaftJE-isfixedly mounted at its ends in brackets 50 attached to the oppo site sides of the supporting. plate 4&- As 'sh'own in Fig. '7, the respective ends of shaft are insertedlin the'brackets 50 and the shaftisheld from turning in the-bracketsby means of pins such as 53 engaging in openings and Blvfonme'd respectively in each bracket and the correspond ing end portion of the shaft.- Inorder' to pivot: the-supporting frame upon the shaft; bearing brackets 58 are attached respectively tothe" side bars l2 offthe frame and are each formed wltli suitably-shapedsockets 6D to receivethe shaft as shown'in-Fig; 4; These brackets are held from disengagement from the" shaft by means ofre: taining' plates 62 attached respectively to the This frame extendsbrackets below the shaft as shown in this figure. The brackets 58 are formed with projections 63 and'the ends ofthe cross bar l8 are interposed between the side bars tZ'of the supporting frame [0 and said projections are secured to said side bars by screws 64.

As shown clearly in the drawings, the shaft db' islocated some distance below the plane of the platen 2 and the brackets 58 extend downwardly from the side bars of the supporting frame a distance corresponding with this difference in the vertical position of the platen and said shaft. The shaft is also located some distance to the rear, of the platen.

7 With this construction, when the supporting frame I 0 is tilted upwardly to the position shown inFig'. 2 to enable a work sheet to be appliedito or-removed fromth'e platen, a. relatively widefr'e'e spaceis openedup between the rear end of the platen 'and said frame and brackets 58- forthe insertion or removal of the worksheet, indicated at S, the rear portion of which maybe rolled up on a hollow roll R; The arrangement of the shaft 48 andthe'bearing' bracket 58 with relation t'othe'platen causes said brackets to swin away from the'rearendof theplaten upon swinging theframe Hf upwardly from closed position. When the frame isswun'g downwardly to locate the type carriage" inworking position with relation to the platen and to clamp the" Work sheet on theplait'en; sai'd'brackets58=swing;back'toward the rear end oftheplat'en; and; if a roll has been inserted in the space beneath the rear end of the platen; thebrackets and crossbar l'B form an enclosure below the rear end of the platen to receivethe rear marginal portion of the work sheet Si The rolledup portion of the sheet is held in this enclosure and the sheetextends from said rolledu'pportion through the elongated opening or slot l5; as shown in Fig; 4.

To limit the upward swinging movement of the frame l0; stoparms 65 having openings. are'fix'edin any suitablemanner to the ends of the shaft 48 projecting beyond the brackets 50.

the endssof' the shaf't'beih'g engaged in said opening's. These arms are connected by a bar 61. Upori'th'e bar 6'1 are'flxedithe 5130p blocks 68 prefer'ably of resilient? material arranged to be engaged' by the side" bars of the supporting frame Hi When the frame" is" swung upwardly to limit the upward movement of the frame. The sto 65 preferably"are'adlustab1e about the shaft I lkto-enablelrthestop blocks'68" to be adifustedto vary the limiting. uppennost position ofthe frame In. To this'end', in the construction shown, each of the armsis. slotted at" TD and a headed draw bolt 12' passed loosel'ythrough an opening in I the portion. of the armv outside the slot. and is 00 threadedunto'theinner'portion of the arm. The arms are fixed to the shaft by tightening the draw bolts and may be adjusted about'the shaft goladjust'the stophblockg'; upon loosening said It is particularly important in thepresent machine. that the-type engage the tracing held on the platen with substantially equal pressures at allpointson each type face. This'will give an ink impression which is substantially uniform 7 throughout each letter" orfigure printed by the types and each letter will have a substantially uniform opacitythroughout. To obtain thissubstantially uniform type impression, it is impor; tant that the platen and the type carriage shall accurately located relatively" and that" the 30 for the line space carriage shall berigidlysup- .ported during a typing operation. This is accomplished in thetpresentmachine- The platen .is

- rigidly supported on the brackets 6 and thesupporting frame I is itself. rigidly supported by .theplaten to. which it isolamped, the side bars of the frame resting on the work sheet lying on the upper. surface of the platen. The tracing or y other work sheet is thus clamped firmly against the upper surface of the platen so as further to ensure the formation of type impressions of uniform opacity. v V

@Thecrossbar I4, attached to theforward'ends oLtheside bars, is located below the side bars and in substantially the plane of the platenwhen the: supporting. frame is closed. The bar I4 is spaced'from the forward end of the platen and in;the space thus provided islocated a supplemental barj-l4 lying. just to the rear of the cross shown in dotted lines in Fig. 5'.

The bar I4 is fixedby means of screws'li to th upper ends of spaced U-shaped brackets I8, the lower ends .of which are hinged to the supporting plate 4, The lower ends of the brackets 18 are connected by a connecting bar 80 secured to the upper sides of the feet of the respective brackets by'means of screws 82. Attached to'the connecting bar 80 are two hinges for supporting the brackets and thereby hingedly supporting the bar 14; Each of these hinges comprises an upper member 84 fixed by means of screws 86. to the under side of the connecting bar 80,9, pintle 88 and a lower hinge member :90 secured by means of screws 92 tothe supporting plate 4.

-' In order to hold down firmly and preferably with some pressure, the forward end of the supporting'and workclamping frame, a latch 94 is pivotedupon a stud 96 fixed in and projecting fromthe-under side-of the cross bar. This latch member is provided with a latch or retaining arm 98 having a turned back inclined or cam portion I00and arranged toengage beneath the supplemental bar I4 as shown in Figure 5 to hold down the forward end of the frame I0.

The latch lever 94 is acted upon by a coiled spring I02 which tends to retain latch arm 98 of the lever in latching position, movement of the lever under the action of the spring being limited by the engagement of. a stop arm I04 on the lever with astop' pin I06 fixed in the cross ba I4.

-To'enable the operator readily to release the latch leverfrom thebar I4 so that the supporting frame ,I0 may be lifted to the position shown in Fig. 2; the machine is provided with a longitudinally movable. latch releaslng'bar or rod I08. This rod is supported at one end by means of an armI I0pivoted on a stud II2 fixed in the undef side of the cross bar I4, the end of the rod being pivotally connected with the arm. The rod I00v is slidably supported at its opposite end by means of two spaced screws I I4 threaded into the underside of the cross bar I4 with their heads spaced from the bar between which screws the rod I00 is vslidablyengaged as shown in Fig. 3.

From the under side of the rod I08 projects a pin I09 arranged to engage a forwardly project ing arm II I on the latch lever to move-the latch lever to latch releasing position. To the free end of the rod I08 is attached a button or disk H5 by which the rod may readily be manipulated.

, With this construction, when the supporting and work clamping frameis swung downwardly into position to locate the line space and type carriages in operating position and to clamp a tracing or other work sheet upon the upper surface of the platen, the lower inclinedface of the turned-back cam portion I00 of the latch lever 94, engages the upper outer corner of the supplemental bar I4 which thenlies in theposition shown in Fig. 5 and the latch arm of the latch lever, is therebypushed back against the action of the spring 'I02 .so that further downward movement of the forward end of the frame finally carries the latch lever below the bar I4 and the latch lever is swung into position to engage the latch arm 98 beneath the bar I4 and thereby clamp the frame firmlyto the platen. To release the latch from the bar I4, the operator grasps the button. I I6 at the right hand end of the rod I08 and moves thegsame to the left. This movementof therod swings the latch lever 94 todi-sengage thelatch arm- 98 from beneath the bar I4 so that the forward end of the frame I0 may then freely be moVedupwardlyr In the drawings the forward portion of the tracing or other worksheet is shown rolled up on a hollow cylinder R. When the supporting and work clamping frame is swung into its upper position and the cross bar I 4 and brackets I8 are located in the position shown in full lines in Fig. 5, said bar and brackets lie in retaining position with relation to the space between the forward end of the platen and the supporting plate 4 thereby obstructingthe insertion or removal of a rolled up portion of the tracing into or from this space. The bar I4 and the brackets E8 are hinged so that they may be swung forwardly and downwardly into the dotted line position shown in Fig. 5, thereby leaving free and unobstructed this space between the forward end of the platen and'the 'supportlngplate 4. When the bar I4 and saidsupporting brackets are in the positions shown in dotted lines in this figure, the rolled up portion. of the tracing may readily be inserted from above and in front of the platen into the space between the forward end of the platen and the plate 4. .Thenwhen the roll of tracing is in place, the bar I4 and the brackets I8 may be swung back-to the position shown in full lines in Fig. 5.to retain the rolled upportion of the tracing in position.

Inorder to hold down the portion of a tracing relation to the platen, brackets 16a are attached respectively to the undersides of the side bars I 2 of said frame and are formed with downwardly extending portions 18a arranged to be located in engagement'with the ends of bar 14 or in close. proximity thereto when the frame I0 is closed. 7

With the above construction, both the platen and the rails carrying the printing mechanism are securely fastened together so that they are at that time.

located. and held in their proper relative pmitions ina reliable; manner: during a typing operation andare both firmly and rigidly supported This enables the upper surface of the platen and the faces of the types, when the types are in striking position, to be maintained exactly in parallel relation to produce type impressions of uniform opacity.

The rear crossbar l'6of the supporting. frame I is formed with upwardly extending: projections Iii-located just outside'the sidebars [2' to engage portions of the line space frame and thereby limit the rearward movement of saidframe. on said side bars.

Fig. 6 shows the manner in which the' work sheet S isclampedi on the platen by the-supporting: and clamping frame lil'. As shown in this figure, the work sheet extends laterally from beneath the side bars l2- of the work clamping frame under the side bars 26 of the line space frame. The plate 120 shown in this figure is one of the usual small plates-attached to the line'space frame and'extending beneath" the side bars of the work clamping frame to prevent the line space frame from: being. moved upwardly with relation to the work clamping frame except when the inner portions of these plates are located: 0pposite recesses in the side bars of the supporting frame I0;

With the above construction; largetracin'gsand other large work sheets may be lettered or typed with letters each having a: substantially. uniform ink deposition and therefore a substantially uniform opacity throughout andv the lettering may be very quickly and efiicientlyperformed; Before inserting a tracing or other work sheet in the machine, the line space frame with the type carriage is moved toits limiting rearward position on the supporting frame I0, the latch lever 94 is manipulated to disengage the same from the under side of the bar, and the supporting frame is swung upwardly substantially to the position shown in'Fig'. 2, until the movement of the frame is stopped by the engagement of the side bars [2 on the frame withthe-stop blocks 68. The bar 14 with the supporting brackets-18 is then swung forwardly tothe position shown in; dotted lines in Fig. The swinging of the supporting and clamping frame [0 upwardly'leaves-i a free and-unobstructed space at the rear of. and beneath the rear end of the platen sothat a roll of the tracing S may be inserted beneath the platen from above and the rear and the tracing may be brought forward over the platen. The swinging of the bar M-forwardly to the. position shown in Fig. 2, and in dotted lines in Fig. 5; leaves a free open space at the front of the platen and beneath the forward end thereof in which may be inserted a roll of the tracing S rolled'uponthe cylinder R. When the'tracing' is located on the platen in position for the typing ofthe data at the desired point thereon, the bar 14" is swung back to the position shown in Fig; 1 and in' full lines in Fig. 5, and the supporting and clamping frame l0 is-swung down to the position-shown in these figures to locate the type carriage in typing position with relation to theplaten andtoclamp the tracing firmly upon the upper surface of the platen. During the last part of' the downward movement of the frame [0, the latch arm- 98 of the latch lever 94 is pushed back by the engagement of the inclined extension I00 with the bar 14 and when the frame has been depressed to clamp-the tracing firmly on the work sheet, the latch lever is: actuated to engage; the latch arm 58 beneath the bar T4 to hold: the frame In securel'y andirlgidly'inoperating position. A "The spaces beyond; the: side edges of the platen are substantially unobstructedbelow the plane ofthe platen. Ifithe: tracing or other work sheet to betype'd is widerthan the platen,.the tracing may extend lateral-1y from. the. platen underneath theside bars 26 ofthe line space-frame as shown in Figs; 1" and 6.. The rolls of the tracingat the forward andrear margins of the platen may extendoutwardly any; distancev from beneath said forward'and: rearmargins;

The parts are preferably constructed and arrangediswthatthe: clamping. frame l0 engages the tracing or other work sheet and its downward pivotal movementds staye'd before the latch arm 98 engagesbeneath the bar. M; Then the forward end of the frame is forced down. slightly until said latch armt-engages beneath the bar 14;.the side mem'bers 1-2 of said frame flexingi slightly during: this depression: ofthe forward end of the frame. The latchwill thereafter clamp the forward end" of the frame in depressed position against the resilience of the sidev members and the work sheet will be clamped firmly on the upper surface of theplaten. a "The above described construction not only enables a. tracing. or other'work sheet to-be quickly and: easily placed on the platen in position for typing: but also tobe very readily shifted, after being placed in the-machine; to change the typing point. Thus the tracing may be shifted laterally by sliding thesame'bodily-across the platen. The tracing: may be shifted forwardly or rearwardly by rolling: up and: unrollirig the rolls at the forward: and rear margins of the tracing as required'.

Having explained thenature and object of the inventiomandhaving' specifically described a con struction embodying the invention in its preferred form;

1 A typewritingtmachine comprising a substantially flat fixed platen; a supporting frame movable toward anolfrom the: platen and arranged to clamp worksheets'upon-the upper surface; of the platen, a carriageframe-supported on said supporting frame and movable thereonin opposite directions over the platen, a carriage mounted on said carriage frame for movement in-opposite directions transverseto the: directions of movement of said carriage frame, printingmechanism carried by the carriage, means for pivotally mounting the supporting frame to swing on a horizontal axis'spaced from one edge of the-platen and at a distance below the plane thereof-such that an unobstructed opening of considerable size beyond said edge is" provided for the insertion of a work sheet when the supporting frame is in open position, means for clamping the latter frame to hold the frame rigidly'to the. platenxand to clamp the work. sheet down firmly against the platen and means for rigidly supporting the plat-' en to leave two opposite edges unobstructed for the full dimension of the platen for the extension of awork sheet of greater dimension t'h'amthe platen beyond said edges into the space" below the platen andgto leave two other opposite edges unobstructedfor the full dimension of the platen for the extension of a work sheet of" greater dimension than the platen beyond said edges" in the direction of the plane of the platen.

2. A typewriting machinecomprising a sup-.- porting plate; asubstantially flat fixed platen rigidly mounted on said-supportingplate inispaced substantially'parallel relation thereto, a supporting frame, a carriage supported on said supporting frame and movable thereon back and-forth over the'platen, a second carriage mounted on said first carriage for movement in opposite direction's, printing mechanism-carried by the latter carriage, means for pivotally mounting the supportingframe to swing on a horizontal axis spaced from one edge of the platen and located at adistance below theplane of the platen such that an unobstructed opening of-considerable size is provided at one edge of therplaten and between the same and the supporting plate for insertion of. a work sheet when .the frame is in open position, means for clamping the opposite part of the frame with relation to the platen to connect rigidly the platen and said frame and to hold the frame down firmly against the work sheet and means for rigidly supporting the platen to leave two opposite edges unobstructed for the full .dimension 'of the platen for the extension of a work sheet of greater dimension than the platen beyond said edges into the space below'the platen and to leave twoother opposite edges unobstructed for the full dimension of the platen for the extension of a work sheet of greater dimension than the platen beyond said edges in the direction of the plane ofthe platen.

3. Aitypewriting machine comprising a support, a substantially fiat platen fixedly mounted on said support in spaced relation thereto, a vertically movable guide frame, .a carriage supported and guided on said guide frame for movement in opposite directions over the platen, a type carriage mounted on said first carriage for movement'in opposite directions transverse to the directions of movement of said first carriage, type mechanisms carried by said type carriage, means for pivotally supporting the guide frame to swing on a hori-:

zontal axis spacedfrorn one margin of the platen and below the plane of the platen whereby an unobstructed opening of considerablev size is provided between said margin and the frame for the insertion of -a work sheet when .theframe is in open position, said means including hinge mem-. bers fixed to the guide frame and nearly enclosing the space between the support and the platen at one or more points along said margin of the platen to hold a roll of the work sheet therein when the frame is closed and means for rigidly supporting the platen to leave two opposite edges unobstructed for the full dimension of the platen for the extension of a work sheet of greater di-- opposite edges unobstructed for the full dimension of the platen for the extension of a work sheet of greater dimension than the platen beyond said edges in the direction of the plane of'the platen. r

4. A typewriting machine comprising a substantially fiatfixed platen, a supporting frame normally supported by the platen and movable toward and from the platen, a carriage mounted on said frame and movable thereon-in opposite directionsiover the platen, a printing carriage supported on said first carriage for movement over the platen in directions transverse to the dimotions of movement of said first carriage, printing mechanism supported on the latter carriage, meansfor pivotally mounting the frame to swing the platen and normally located in substantially the plane of the platen and spaced from the adjacent edge thereof to leave a slot for the passage 'ofthe work sheet'anda clamping device for clamping; a part of said frame remote from its axis to said transverse bar to hold the frame securely and rigidly in printing position.

' face of the platen'and arranged to clamp work sheets thereon, a carriage mounted on said frame and reciprocatable thereon over the platen; a type carriage supported on said first carriage for movementin directions substantially perpendicular to the directions of movement of said first carriage, type: mechanisms-carried bythe latter carriage, means for pivotally supporting the frame toswing on a horizontal axis adjacent one end of, the platen, a transverse bar at the opposite end ofthe platen and normally located in, substantially the plane of theplaten and spaced from the adjacent end of the platen to leave a slot for the passage of the work sheet, means for supporting said transverse bar for movement away from the adjacent-end" of the platen to leave a clear space for the insertion and removal of a work sheet and an: attaching device for: attaching that part of said frameadjacent said transverse bar to said bar to hold theframe rigidly with relation to the platen. g r

6. A typewriting machine comprising a platen support, a substantially flat platen fixed to said supportin spaced relation'thereto, a vertically movable supporting "structure normally supported by the upper surface of the platen, a framemovable'back and forth 'on said structure, a car-- riage supported on said frame-for movement in opposite directions, printing mechanism carriedby @the carriage, means for pivotally supporting said structure to swing on a horizontal axis relatively adjacent one edge of the platen, a transverse bar at the opposite edge'of the platen normally located in substantially the plane of the platenand spaced from the adjacent edge of the platen to leave ;a slot for the passage of the worksheet, a'clamping device for clamping the part of said structure adjacent said transverse bar tosaid bar to hold the structure firmly and securely with relation to the platen and means for mounting said bar nearly enclosing, at one or -,more-point s along the length of thebar, the

space; between the platen and said support at the adjacent'edge of'the'platen to hold a roll of thework sheet therein.- p

,7. A typewriting machine comprising a support,

a substantially fiat fixed platen mounted inspaced relation to saidsupport, a vertically movable track frame normally supported by the platen and having guide tracks thereon, a second frame fmounted on said tracks and movable thereon back and forth over the platen, a carriage'supported on said' second frame for move-- ment in directions transverse to the directions of movement of the second frame, printing mecha-- platen normally-located in substantially the plane ofthe 'platenandspaced from the adjacent margiri*of;the' platen to leave a slot for the passage ofth work sheet, means for supporting said bar for movement away from theadjacent marginofi the platen to leave a clear space inside of and below the bar for the insertion of the work sheet, said means being arranged nearly to enclose, at 

